US PATENT SUBCLASS 327 / 72
.~.~ Input signal compared to reference derived therefrom

Current as of: June, 1999
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327 /   HD   MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS

1  DF  SPECIFIC SIGNAL DISCRIMINATING (E.G., COMPARING, SELECTING, ETC.) WITHOUT SUBSEQUENT CONTROL {11}
50  DF  .~ By amplitude {9}
72.~.~ Input signal compared to reference derived therefrom {1}
73  DF  .~.~.~> Reference derived by feedback

DEFINITION

Classification: 327/72

Input signal compared to reference derived therefrom:

(under subclass 50) Subject matter wherein a signal from an external source is evaluated relative to a voltage or current obtained by processing signals from the same source.

(1) Note. For classification herein, either the processing or means therefor should be recited.

SEE OR SEARCH THIS CLASS, SUBCLASS:

68, for amplitude discriminating between plural varying inputs where at least one of the input signals is a varying reference.

74+, for an input signal compared to plural fixed references.

205+, for stable state circuits utilizing hysteresis.

SEE OR SEARCH CLASS 326, Electronic Digital Logic Circuits,

22+, for input noise margin enhancement.